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database.go
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database.go
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package main
import (
"crypto/sha256"
"database/sql"
"encoding/json"
"errors"
"fmt"
"time"
"github.com/apex/log"
"github.com/lib/pq"
)
// Database - used to access the database
type Database struct {
mel *Melodious
db *sql.DB
}
// GetUsersList - gets users' data stored in the database
func (db *Database) GetUsersList() ([]*User, error) {
rows, err := db.db.Query(`
SELECT id, username, owner FROM melodious.accounts WHERE banned=false;
`)
if err != nil {
return []*User{}, err
}
users := []*User{}
for rows.Next() {
user := &User{}
err := rows.Scan(&(user.ID), &(user.Username), &(user.Owner))
if err != nil {
return []*User{}, err
}
users = append(users, user)
}
return users, nil
}
// HasUsers - checks if there are any users registered
func (db *Database) HasUsers() (bool, error) {
row := db.db.QueryRow(`
SELECT id FROM melodious.accounts LIMIT 1;
`)
var id int
err := row.Scan(&id)
if err == sql.ErrNoRows {
return false, nil
} else if err != nil {
return false, err
}
return true, err
}
// RegisterUser - adds a new user to the database
func (db *Database) RegisterUser(name string, passhash string, ip string) error {
return db.RegisterUserOwner(name, passhash, false, ip)
}
// RegisterUserOwner - adds a new user to the database, possibly owner
func (db *Database) RegisterUserOwner(name string, passhash string, owner bool, ip string) error {
sum := sha256.Sum256([]byte(passhash))
sumstr := fmt.Sprintf("%x", sum[:32])
_, err := db.db.Exec(`
INSERT INTO melodious.accounts (username, passhash, owner) VALUES ($1, $2, $3);
`, name, sumstr, owner)
if err != nil {
return err
}
return nil
}
// DeleteUser - deletes/unregisters a user
func (db *Database) DeleteUser(name string) error {
_, err := db.db.Exec(`
DELETE FROM melodious.accounts WHERE username=$1;
`, name)
if err != nil {
return err
}
return nil
}
// DeleteUserID - deletes/unregisters a user by their id
func (db *Database) DeleteUserID(id int) error {
_, err := db.db.Exec(`
DELETE FROM melodious.accounts WHERE id=$1;
`, id)
if err != nil {
return err
}
return nil
}
// GetUserID - gets id of user with the given username.
// Always check if returned error is not nil, as it returns -1 on errors
func (db *Database) GetUserID(name string) (int, error) {
row := db.db.QueryRow(`
SELECT id FROM melodious.accounts WHERE username=$1 LIMIT 1;
`, name)
var id int
err := row.Scan(&id)
if err == sql.ErrNoRows {
return -1, errors.New("no such user")
} else if err != nil {
return -1, err
}
return 0, err
}
// UserExists - checks if user with given name exists.
// Always check if returned error is not-nil, as it returns false on errors
func (db *Database) UserExists(name string) (bool, error) {
row := db.db.QueryRow(`
SELECT id FROM melodious.accounts WHERE username=$1 LIMIT 1;
`, name)
var id int // this is unused though
err := row.Scan(&id)
if err == sql.ErrNoRows {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
// UserExistsID - checks if user with given id exists.
// Always check if returned error is not-nil, as it returns false on errors
func (db *Database) UserExistsID(id int) (bool, error) {
row := db.db.QueryRow(`
SELECT id FROM melodious.accounts WHERE id=$1 LIMIT 1;
`, id)
var _id int // this is unused though
err := row.Scan(&_id)
if err == sql.ErrNoRows {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
// CheckUserPassword - checks if there's a user with the given password.
// Always check if returned error is not-nil, as it returns false on errors
func (db *Database) CheckUserPassword(name string, passhash string) (bool, error) {
sum := sha256.Sum256([]byte(passhash))
sumstr := fmt.Sprintf("%x", sum[:32])
row := db.db.QueryRow(`
SELECT id FROM melodious.accounts WHERE username=$1 AND passhash=$2 LIMIT 1;
`, name, sumstr)
var id int // this is unused though
err := row.Scan(&id)
if err == sql.ErrNoRows {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
// CheckUserPasswordID - checks if there's a user with the given password.
// Always check if returned error is not-nil, as it returns false on errors
func (db *Database) CheckUserPasswordID(id int, passhash string) (bool, error) {
sum := sha256.Sum256([]byte(passhash))
sumstr := fmt.Sprintf("%x", sum[:32])
row := db.db.QueryRow(`
SELECT id FROM melodious.accounts WHERE id=$1 AND passhash=$2 LIMIT 1;
`, id, sumstr)
var _id int // this is unused though
err := row.Scan(&_id)
if err == sql.ErrNoRows {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
// IsUserOwner - checks if user with given name is an owner
func (db *Database) IsUserOwner(name string) (bool, error) {
row := db.db.QueryRow(`
SELECT id FROM melodious.accounts WHERE username=$1 AND owner=TRUE LIMIT 1;
`, name)
var id int // this is unused though
err := row.Scan(&id)
if err == sql.ErrNoRows {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
// IsUserOwnerID - checks if user with given id is an owner
func (db *Database) IsUserOwnerID(id int) (bool, error) {
row := db.db.QueryRow(`
SELECT id FROM melodious.accounts WHERE id=$1 AND owner=TRUE LIMIT 1;
`, id)
var _id int // this is unused though
err := row.Scan(&_id)
if err == sql.ErrNoRows {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
// SetUserOwner - sets users owner status
func (db *Database) SetUserOwner(name string, owner bool) error {
_, err := db.db.Exec(`
UPDATE melodious.accounts SET owner=$1 WHERE username=$2;
`, owner, name)
if err != nil {
return err
}
return nil
}
// SetUserOwnerID - sets users owner status
func (db *Database) SetUserOwnerID(id int, owner bool) error {
_, err := db.db.Exec(`
UPDATE melodious.accounts SET owner=$1 WHERE id=$2;
`, owner, id)
if err != nil {
return err
}
return nil
}
// Ban - sets user's banned flag to true
func (db *Database) Ban(username string) error {
_, err := db.db.Exec(`
UPDATE melodious.accounts SET banned=true WHERE username=$1;
`, username)
if err != nil {
return err
}
return nil
}
// BanID - sets user's banned flag to true by id
func (db *Database) BanID(id int) error {
_, err := db.db.Exec(`
UPDATE melodious.accounts SET banned=true WHERE id=$1;
`, id)
if err != nil {
return err
}
return nil
}
// IsUserBanned - checks if the given user with ip is banned
func (db *Database) IsUserBanned(username string, ip string) (bool, error) {
row := db.db.QueryRow(`
SELECT banned FROM melodious.accounts WHERE username=$1 OR ip=$2;
`, username, ip)
var banned bool
err := row.Scan(&banned)
if err == sql.ErrNoRows {
return false, nil
} else if err != nil {
return false, err
}
return banned, nil
}
// IsUserBannedID - checks if the given user by id with ip is banned
func (db *Database) IsUserBannedID(id int, ip string) (bool, error) {
row := db.db.QueryRow(`
SELECT banned FROM melodious.accounts WHERE id=$1 OR ip=$2;
`, id, ip)
var banned bool
err := row.Scan(&banned)
if err == sql.ErrNoRows {
return false, nil
} else if err != nil {
return false, err
}
return banned, nil
}
// GetAccountCount - gets a count of all accounts that are on the same IP.
func (db *Database) GetAccountCount(ip string) (int, error) {
row := db.db.QueryRow(`
SELECT COUNT(*) FROM melodious.accounts WHERE ip=$1;
`, ip)
var count int
err := row.Scan(&count)
if err != nil {
return -1, err
}
return count, nil
}
// NewChannel - creates a new channel
func (db *Database) NewChannel(name string, topic string) error {
_, err := db.db.Exec(`
INSERT INTO melodious.channels (name, topic) VALUES ($1, $2);
`, name, topic)
if err != nil {
return err
}
return nil
}
// DeleteChannel - deletes given channel
func (db *Database) DeleteChannel(name string) error {
_, err := db.db.Exec(`
DELETE FROM melodious.channels WHERE name=$1;
`, name)
if err != nil {
return err
}
return nil
}
// DeleteChannelID - deletes given channel by ID
func (db *Database) DeleteChannelID(id int) error {
_, err := db.db.Exec(`
DELETE FROM melodious.channels WHERE id=$1;
`, id)
if err != nil {
return err
}
return nil
}
// ListChannels - puts all channel names into an array of Channel structs
func (db *Database) ListChannels() ([]*Channel, error) {
rows, err := db.db.Query(`
SELECT id, name, topic FROM melodious.channels;
`)
if err != nil {
return nil, err
}
defer rows.Close()
m := []*Channel{}
for rows.Next() {
chnl := &Channel{}
if err := rows.Scan(&(chnl.ID), &(chnl.Name), &(chnl.Topic)); err != nil {
return nil, err
}
m = append(m, chnl)
}
return m, nil
}
// ChannelExists - checks if a channel exists
func (db *Database) ChannelExists(name string) (bool, error) {
row := db.db.QueryRow(`
SELECT EXISTS(SELECT * FROM melodious.channels WHERE name=$1);
`, name)
var exists bool
err := row.Scan(&exists)
if err != nil {
return false, err
}
return exists, nil
}
// SetChannelTopic - sets topic of the channel
func (db *Database) SetChannelTopic(name string, topic string) error {
_, err := db.db.Exec(`
UPDATE melodious.channels SET topic=$2 WHERE name=$1;
`, name, topic)
if err != nil {
return err
}
return nil
}
// DeleteOldMessages - deletes old messages from the database
func (db *Database) DeleteOldMessages(period string) error {
_, err := db.db.Exec(`
DELETE FROM melodious.messages WHERE dt < (NOW() - $1::INTERVAL);
`, period)
if err != nil {
return err
}
return nil
}
// PostMessage - posts a new message
func (db *Database) PostMessage(chanName string, message string, pings []string, author string) (*ChatMessage, error) {
row := db.db.QueryRow(`
INSERT INTO melodious.messages
(chan_id, message, dt, pings, author_id)
VALUES (
(SELECT id FROM melodious.channels WHERE name=$1 LIMIT 1),
$2,
NOW(),
$3,
(SELECT id FROM melodious.accounts WHERE username=$4 LIMIT 1)
)
RETURNING message, pings, id, dt, $4, author_id;
`, chanName, message, pq.Array(pings), author)
msg := &ChatMessage{}
var cpings pq.StringArray
err := row.Scan(&(msg.Message), &cpings, &(msg.ID), &(msg.Timestamp), &(msg.Author), &(msg.AuthorID))
if err != nil {
return nil, err
}
msg.Pings = []string(cpings)
return msg, nil
}
// PostMessageChanID - posts a new message
func (db *Database) PostMessageChanID(chanID int, message string, pings []string, author string) error {
_, err := db.db.Exec(`
INSERT INTO melodious.messages
(chan_id, message, dt, pings, author_id)
VALUES (
(SELECT id FROM melodious.channels WHERE id=$1 LIMIT 1),
$2,
NOW(),
$3,
(SELECT id FROM melodious.accounts WHERE username=$4 LIMIT 1)
);
`, chanID, message, pq.Array(pings), author)
if err != nil {
return err
}
return nil
}
// DeleteMessage - deletes a message by ID.
func (db *Database) DeleteMessage(id int) error {
_, err := db.db.Exec(`
DELETE FROM melodious.messages WHERE id=$1;
`, id)
if err != nil {
return err
}
return nil
}
// EditMessage - edits a message by ID.
//func (db *Database) EditMessage(id int, content string) {
//todo
//}
// GetMessages - gets last n messages in a channel starting from an id from the database
func (db *Database) GetMessages(chanid int, msgid int, amount int) ([]*ChatMessage, error) {
rows, err := db.db.Query(`
SELECT
m.id,
m.message,
m.dt,
m.pings,
a.username author,
m.author_id
FROM melodious.messages m
INNER JOIN melodious.accounts a ON m.author_id = a.id
WHERE m.chan_id=$1 AND m.id<$2
ORDER BY m.id DESC
LIMIT $3;
`, chanid, msgid, amount)
if err != nil {
return []*ChatMessage{}, err
}
msgs := []*ChatMessage{}
for rows.Next() {
msg := &ChatMessage{}
var pings pq.StringArray
err := rows.Scan(&(msg.ID), &(msg.Message), &(msg.Timestamp), &pings, &(msg.Author), &(msg.AuthorID))
if err != nil {
return []*ChatMessage{}, err
}
msg.Pings = []string(pings)
msgs = append(msgs, msg)
}
return msgs, nil
}
// GetMessageDetails - gets a message and the channel it's from by id
func (db *Database) GetMessageDetails(id int) (string, *ChatMessage, error) {
row := db.db.QueryRow(`
SELECT
m.message,
m.dt,
m.pings,
a.username author,
m.author_id,
c.name channel
FROM melodious.messages m
INNER JOIN melodious.accounts a ON m.author_id = a.id
INNER JOIN melodious.channels c ON m.chan_id = c.id
WHERE m.id=$1;
`, id)
var pings pq.StringArray
var channel string
msg := &ChatMessage{}
err := row.Scan(&(msg.Message), &(msg.Timestamp), &pings, &(msg.Author), &(msg.AuthorID), &channel)
if err != nil {
return "", &ChatMessage{}, err
}
msg.Pings = []string(pings)
msg.ID = id
return channel, msg, nil
}
// AddGroup - adds a group
func (db *Database) AddGroup(name string) (int, error) {
row := db.db.QueryRow(`
INSERT INTO melodious.groups (name) VALUES ($1) RETURNING id;
`, name)
var id int
err := row.Scan(&id)
if err != nil {
return -1, err
}
return id, nil
}
// DeleteGroup - deletes a group
func (db *Database) DeleteGroup(name string) error {
_, err := db.db.Exec(`
DELETE FROM melodious.groups WHERE name=$1;
`, name)
return err
}
// GroupExists - checks if a group exists
func (db *Database) GroupExists(name string) (bool, error) {
row := db.db.QueryRow(`
SELECT EXISTS(SELECT * FROM melodious.groups WHERE name=$1);
`, name)
var exists bool
err := row.Scan(&exists)
if err != nil {
return false, err
}
return exists, nil
}
// GroupExistsID - checks if a group exists by its id
func (db *Database) GroupExistsID(id int) (bool, error) {
row := db.db.QueryRow(`
SELECT EXISTS(SELECT * FROM melodious.groups WHERE id=$1);
`, id)
var exists bool
err := row.Scan(&exists)
if err != nil {
return false, err
}
return exists, nil
}
// SetFlag - sets a flag. Returns a flag id
func (db *Database) SetFlag(flag *Flag) (int, error) {
data, err := json.Marshal(flag.Flag)
if err != nil {
return -1, err
}
row := db.db.QueryRow(`
SELECT melodious.set_flag($1, $2, $3::JSON);
`, flag.Group, flag.Name, string(data))
var id int
err = row.Scan(&id)
if err != nil {
return -1, err
}
return id, nil
}
// DeleteFlag - deletes a flag.
func (db *Database) DeleteFlag(flag *Flag) error {
_, err := db.db.Exec(`
CALL melodious.delete_flag($1, $2);
`, flag.Group, flag.Name)
return err
}
// AddGroupHolder - adds a group holder
func (db *Database) AddGroupHolder(gh *GroupHolder) (int, error) {
// make sure if strings are empty we pass NULL to PostgreSQL
var user interface{}
var channel interface{}
if gh.User != "" {
user = gh.User
} else {
user = nil
}
if gh.Channel != "" {
channel = gh.Channel
} else {
channel = nil
}
row := db.db.QueryRow(`
SELECT melodious.insert_group_holder($1, $2, $3);
`, gh.Group, user, channel)
var id int
err := row.Scan(&id)
if err != nil {
return -1, err
}
return id, nil
}
// DeleteGroupHolder - deletes a group holder
func (db *Database) DeleteGroupHolder(id int) error {
_, err := db.db.Exec(`
DELETE FROM melodious.group_holders WHERE id=$1;
`, id)
return err
}
// DeleteGroupHolders - deletes group holders by template. Use empty strings where you usually would use a *
func (db *Database) DeleteGroupHolders(gh GroupHolder) error {
_, err := db.db.Exec(`
CALL melodious.delete_group_holders($1, $2, $3);
`, gh.Group, gh.User, gh.Channel)
return err
}
// QueryFlags -
// When checkflags:
// true - queries if theres a flag available to the given channel/user/user-on-channel
// false - queries flags using given pattern. Use empty strings where you usually would use a *
func (db *Database) QueryFlags(user string, channel string, group string, flag string, checkflags bool) ([]*FlagQueryResult, error) {
rows, err := db.db.Query(`
SELECT group_holders, flag_id, flag_name, flag FROM melodious.query_flags($1, $2, $3, $4, $5);
`, user, channel, group, flag, checkflags)
if err != nil {
return nil, err
}
var s []*FlagQueryResult
for rows.Next() {
var sa pq.StringArray
var fid int
var fn string
var fs string
if err := rows.Scan(&sa, &fid, &fn, &fs); err != nil {
return nil, err
}
fqr := &FlagQueryResult{}
fqr.GroupHolders = []*GroupHolderFQResult{}
fqr.FlagID = fid
fqr.FlagName = fn
err = json.Unmarshal([]byte(fs), &(fqr.Flag))
if err != nil {
return nil, err
}
for _, gh := range sa {
r := &GroupHolderFQResult{}
err := json.Unmarshal([]byte(gh), r)
if err != nil {
return nil, err
}
fqr.GroupHolders = append(fqr.GroupHolders, r)
}
s = append(s, fqr)
}
return s, nil
}
// HasFlag - checks if given user has a flag
func (db *Database) HasFlag(user string, channel string, flag string) (bool, error) {
row := db.db.QueryRow(`
SELECT EXISTS(SELECT 1 FROM melodious.query_flags($1, $2, '', $3, true) LIMIT 1);
`, user, channel, flag)
var exists bool
err := row.Scan(&exists)
if err != nil {
return false, err
}
return exists, nil
}
// HasFlagChID - checks if given user has a flag
func (db *Database) HasFlagChID(user string, channel int, flag string) (bool, error) {
row := db.db.QueryRow(`
SELECT EXISTS(SELECT 1 FROM melodious.query_flags($1, (SELECT name FROM melodious.channels WHERE id=$2 LIMIT 1), '', $3, true) LIMIT 1);
`, user, channel, flag)
var exists bool
err := row.Scan(&exists)
if err != nil {
return false, err
}
return exists, nil
}
// GetUser - gets a user's info by their ID
func (db *Database) GetUser(id int) (*User, error) {
row := db.db.QueryRow(`
SELECT id, username, owner FROM melodious.accounts WHERE id=$1;
`, id)
user := &User{}
err := row.Scan(&(user.ID), &(user.Username), &(user.Owner))
if err != nil {
return &User{}, err
}
return user, nil
}
// GetGroupHolders - gets all group holders that exist
func (db *Database) GetGroupHolders() ([]*GroupHolder, error) {
rows, err := db.db.Query(`
SELECT
gh.id,
(SELECT name AS group FROM melodious.groups WHERE id=gh.group_id),
(SELECT username AS user FROM melodious.accounts WHERE id=gh.user_id),
(SELECT name AS channel FROM melodious.channels WHERE id=gh.channel_id)
FROM melodious.group_holders gh;
`)
if err != nil {
return []*GroupHolder{}, err
}
ghs := []*GroupHolder{}
for rows.Next() {
gh := &GroupHolder{}
// NULL handling
var user interface{}
var channel interface{}
err = rows.Scan(&(gh.ID), &(gh.Group), &user, &channel)
if err != nil {
return []*GroupHolder{}, err
}
switch user.(type) {
case string:
gh.User = user.(string)
}
switch channel.(type) {
case string:
gh.Channel = channel.(string)
}
ghs = append(ghs, gh)
}
return ghs, nil
}
// GroupHolderExists - checks if a group holder with the specified id exists
func (db *Database) GroupHolderExists(id int) (bool, error) {
row := db.db.QueryRow(`
SELECT EXISTS(SELECT * FROM melodious.group_holders WHERE id=$1)
`, id)
var exists bool
err := row.Scan(&exists)
if err != nil {
return false, err
}
return exists, nil
}
// GetGroups - gets all groups that exist
func (db *Database) GetGroups() ([]*Group, error) {
rows, err := db.db.Query(`
SELECT * FROM melodious.groups;
`)
if err != nil {
return []*Group{}, err
}
groups := []*Group{}
for rows.Next() {
group := &Group{}
err = rows.Scan(&(group.ID), &(group.Name))
if err != nil {
return []*Group{}, err
}
groups = append(groups, group)
}
return groups, nil
}
// GetFlags - gets all flags from a group by its id
func (db *Database) GetFlags(groupid int) ([]*Flag, error) {
rows, err := db.db.Query(`
SELECT
id,
(SELECT name AS group FROM melodious.groups WHERE id=flags.group_id),
name,
flag
FROM melodious.group_flags flags WHERE group_id=$1;
`, groupid)
if err != nil {
return []*Flag{}, err
}
flags := []*Flag{}
for rows.Next() {
flag := &Flag{}
var rawjson []byte
var flagjson map[string]interface{}
err = rows.Scan(&(flag.ID), &(flag.Group), &(flag.Name), &rawjson)
if err != nil {
return []*Flag{}, err
}
err = json.Unmarshal(rawjson, &flagjson)
if err != nil {
return []*Flag{}, err
}
flag.Flag = flagjson
flags = append(flags, flag)
}
return flags, nil
}
// NewDatabase - creates a new Database instance
func NewDatabase(mel *Melodious, addr string) (*Database, error) {
db, err := sql.Open("postgres", addr)
_, err = db.Exec(`CREATE SCHEMA IF NOT EXISTS melodious;`)
if err != nil {
return nil, err
}
log.Info("DB: check/create melodious schema")
_, err = db.Exec(`
CREATE TABLE IF NOT EXISTS melodious.accounts (
id serial NOT NULL PRIMARY KEY,
username varchar(32) NOT NULL UNIQUE,
passhash varchar(64) NOT NULL,
owner BOOLEAN NOT NULL,
banned BOOLEAN NOT NULL DEFAULT false,
ip inet NOT NULL DEFAULT '0.0.0.0'
);`)
if err != nil {
return nil, err
}
log.Info("DB: check/create accounts table")
_, err = db.Exec(`
CREATE TABLE IF NOT EXISTS melodious.channels (
id serial NOT NULL PRIMARY KEY,
name varchar(32) NOT NULL UNIQUE,
topic varchar(128) NOT NULL
);`)
if err != nil {
return nil, err
}
log.Info("DB: check/create channels table")
_, err = db.Exec(`
CREATE TABLE IF NOT EXISTS melodious.messages (
id serial NOT NULL PRIMARY KEY,
chan_id int4 NOT NULL REFERENCES melodious.channels(id) ON DELETE CASCADE,
author_id int4 NOT NULL REFERENCES melodious.accounts(id) ON DELETE CASCADE,
message varchar(2048) NOT NULL,
dt timestamp with time zone NOT NULL,
pings varchar(32) []
);`)
if err != nil {
return nil, err
}
log.Info("DB: check/create messages table")
_, err = db.Exec(`
CREATE TABLE IF NOT EXISTS melodious.groups (
id serial NOT NULL PRIMARY KEY,
name varchar(32) NOT NULL
);`)
if err != nil {
return nil, err
}
log.Info("DB: check/create groups table")
_, err = db.Exec(`
CREATE TABLE IF NOT EXISTS melodious.group_holders (
id serial NOT NULL PRIMARY KEY,
group_id int4 NOT NULL REFERENCES melodious.groups(id) ON DELETE CASCADE,
user_id int4 REFERENCES melodious.accounts(id) ON DELETE CASCADE,
channel_id int4 REFERENCES melodious.channels(id) ON DELETE CASCADE,
UNIQUE(group_id, user_id, channel_id)
);`)
if err != nil {
return nil, err
}
log.Info("DB: check/create group_holders table")
_, err = db.Exec(`
CREATE TABLE IF NOT EXISTS melodious.group_flags (
id serial NOT NULL PRIMARY KEY,
group_id int4 NOT NULL REFERENCES melodious.groups(id) ON DELETE CASCADE,
name varchar(32) NOT NULL,
flag jsonb NOT NULL,
UNIQUE(group_id, name)
);`)
if err != nil {
return nil, err
}
log.Info("DB: check/create group_flags table")
_, err = db.Exec(`
CREATE OR REPLACE FUNCTION melodious.set_flag(group_name varchar(32), flag_name varchar(32), flag_data jsonb)
RETURNS int4
LANGUAGE plpgsql
AS $$
DECLARE
fid int4 := NULL;
gid int4 := NULL;
BEGIN
SELECT id INTO gid FROM melodious.groups WHERE name=group_name;
SELECT id INTO fid FROM melodious.group_flags WHERE group_id=gid AND name=flag_name;
IF fid IS NULL THEN
INSERT INTO melodious.group_flags (group_id, name, flag) VALUES (gid, flag_name, flag_data) RETURNING id INTO fid;
RETURN fid;
ELSE
UPDATE melodious.group_flags SET flag=flag_data WHERE id=fid;
RETURN fid;
END IF;
END;
$$;
`)
if err != nil {
return nil, err
}
log.Info("DB: check/create set_flag function")
_, err = db.Exec(`
CREATE OR REPLACE PROCEDURE melodious.delete_flag(group_name varchar(32), flag_name varchar(32))
LANGUAGE plpgsql
AS $$
DECLARE
gid int4 := NULL;
BEGIN
SELECT id INTO gid FROM melodious.groups WHERE name=group_name;
IF gid IS NOT NULL THEN
DELETE FROM melodious.group_flags WHERE group_id=gid AND name=flag_name;
END IF;
END;
$$;
`)
if err != nil {
return nil, err
}
log.Info("DB: check/create delete_flag procedure")
_, err = db.Exec(`
CREATE OR REPLACE FUNCTION melodious.insert_group_holder(group_name varchar(32), user_name varchar(32), chan_name varchar(32))
RETURNS int4
LANGUAGE plpgsql
AS $$
DECLARE
gid int4 := NULL;
uid int4 := NULL;
cid int4 := NULL;
ghid int4 := NULL;
BEGIN
SELECT id INTO gid FROM melodious.groups WHERE name=group_name;
IF gid IS NULL THEN
RAISE EXCEPTION 'no such group';
END IF;
IF user_name <> '' THEN
SELECT id INTO uid FROM melodious.accounts WHERE username=user_name;
IF uid IS NULL THEN
RAISE EXCEPTION 'no such user';
END IF;
END IF;
IF chan_name <> '' THEN
SELECT id INTO cid FROM melodious.channels WHERE name=chan_name;
IF cid IS NULL THEN
RAISE EXCEPTION 'no such channel';
END IF;
END IF;
INSERT INTO melodious.group_holders (group_id, user_id, channel_id) VALUES (gid, uid, cid) RETURNING id INTO ghid;
RETURN ghid;
END;
$$;
`)
if err != nil {
return nil, err
}
log.Info("DB: check/create insert_group_holder function")